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Finding the Fourth Proportional to 28.76, 42.80 and 27.48

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Solution

The fourth proportional to 28.76, 42.80 and 27.48 is: 40.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.76 : 42.80 = 27.48 : x
  2. Step 2: Convert to fraction form
    28.76/42.80 = 27.48/x
  3. Step 3: Cross multiply
    28.76x = 42.80 × 27.48
  4. Step 4: Simplify right side
    28.76x = 1,176.14
  5. Step 5: Solve for x
    x = 1,176.14/28.76
  6. Step 6: Final answer
    x = 40.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.